Question about 1999 Cadillac DeVille

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I have a 99 deville once the coolant is filled the car stil reads check coolant level. I recently had one of the coolant pipes replaced. My car over heats after driven for a little while then the coolant overflows out. What would make the coolant level say check level even when full and its not leaking out

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  • Cadillac Master
  • 53,765 Answers

Air lock in the system
have it professionally bled out at a radiator shop

Posted on Dec 28, 2017

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6ya staff

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Posted on Jan 02, 2017

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dealt_soul

James Bradburn

  • 296 Answers

SOURCE: im receiving a check coolant

No the light is linked to a sensor. There is a coolent sensor that tells you that the level is low. It sounds like the sensor has gone bad. And the sensor is located in the coolent tank. If it is bad from my understanding you have to replace the whole tank. But take a paper clip with the engine off and disconnect the wire harness from the sensor and jump the wires and see if the light goes off.

Posted on Jan 20, 2009

Thomas F. Schneider

  • 2715 Answers

SOURCE: 99 Cadillac Deville Coolant Leak

Most likely a cracked block or free plug that came out or loose. Other options are hozes, which I believe the dealer would have fixed. A third option is the water pump itself. 

Posted on May 06, 2009

John Bloomfield

  • 534 Answers

SOURCE: 99 deville head gasket leak?

A head gasket leak is usually indicated (among other things) by continous overheating of the motor, and subsequent loss of coolant.
It can also be indicated by the presence of engine combustion gas bubbles in the coolant resevoir.
Ensure the coolant system has no external leaks, such as faulty hose/s, radiator etc.

Ensure motor tune or other motor mechanical condition is not the cause of overheating.
I assume the motor is actually running hot.

Check cooling fans are operating ok (as necessary when car warms up):- if not check
1) fuse,
2) relay operation,
3) heat sensor switch.

Check/replace the thermostat,
Check the coolant pressure cap is serviceable & of correct rating,
Ensure cooling system is correctly filled, bleed off any airlocks as necessary when re-filling,
Ensure radiator hose on suction side of waterpump is not collapsing at engine revs above idle (due softening),
If the motor has been severely overheated, the head gasket could be blown - look for combustion gas bubbles in the coolant resevoir.

Posted on Sep 21, 2009

Testimonial: "thx..my car is not overheating.only had to pull off road once.it does get to 233 sometime."

Kravcar

Mark Carrington

  • 192 Answers

SOURCE: 97 cadillac eldorado overflowing through overflow pipe

The most common overheating problem with the Northstar engine is a blocked purge line. It's job is to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank(not the cap),this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.The hose goes in to the engine to a crossover and comes out the other side to near the thermostat housing,the blockage may be there.

Posted on Apr 16, 2010

Kravcar

Mark Carrington

  • 192 Answers

SOURCE: COOLANT LEAKS ONLY WHEN CAR

From the way you describe it, It is likely the pressure cap on the surge tank (expansion/overflow coolant tank).
It is probably worn and no longer able to hold the pressure.
The cap is an inexpensive replacement so do this first.

Posted on Sep 14, 2010

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1 Answer

Bleed cooling system


Remove the coolant reservoir cap. fill it 3/4 full. start the car. You will have to run it to operating temperature. When the thermostat opens up, the coolant from the reservoir will start to drop. add more, but only to the hot mark. Reving up the engine will push out air in the system. Once the air is out (you will now as the heater will blower a constant hot air) Check the coolant level again. Fill as necessary.

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Hi, There are two metal pipes on that side of the engine that supply coolant to and from the heater core. One or both of the pipes may have rusted through. Need to pressure check cooling sysem and visually check.

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Have an 02 Cadillac Deville with 32k miles on it. Had a Cadillac dealer flush coolant and replace, and now every time I start the car the DIC reads "Check Coolant Level". Coolant level is fine. Now the...


Why replace the radiator it's just a bad sensor. Get the Haynes repair manual on your vehicle look up the water level sensor testing and replacement steps. The sensor probably cost around $30 and I doubt if it takes more than 30 minutes to replace.

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1 Answer

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CHECK THE HIGHT OF THE HEATER MATRIX IN THE CAB , IF ITS HIGHER THAN THE FILLER/EXPANSION TANK. THEN ITS AN AIR LOCK, LOOK FOR THE HIGHEST PIPE AND SEE IF THERE IS A BLEED VALVE, IF NOT TAKE BOTH PIPES OFF THE MATRIX FEEDS AND FLUSH OUT TO SEE IF IT IS BLOCKED, AND RECONNECT LOWEST PIPE FIRST AND FILL SYSTYM TILL WATER APPEAR FROM TOP AND RECONNECT RUN MOTOR, AND KEEP TOPIN UP.

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3 Answers

99 deville head gasket leak?


A head gasket leak is usually indicated (among other things) by continous overheating of the motor, and subsequent loss of coolant.
It can also be indicated by the presence of engine combustion gas bubbles in the coolant resevoir.
Ensure the coolant system has no external leaks, such as faulty hose/s, radiator etc.

Ensure motor tune or other motor mechanical condition is not the cause of overheating.
I assume the motor is actually running hot.

Check cooling fans are operating ok (as necessary when car warms up):- if not check
1) fuse,
2) relay operation,
3) heat sensor switch.

Check/replace the thermostat,
Check the coolant pressure cap is serviceable & of correct rating,
Ensure cooling system is correctly filled, bleed off any airlocks as necessary when re-filling,
Ensure radiator hose on suction side of waterpump is not collapsing at engine revs above idle (due softening),
If the motor has been severely overheated, the head gasket could be blown - look for combustion gas bubbles in the coolant resevoir.

Sep 21, 2009 | 1999 Cadillac DeVille

2 Answers

1996 cadillac deville overheat..radiator?


Check for coolant flow at the Purge line,this is a common problem on the Northstar.
There is a small diameter hose coming from near the top of the coolant tank,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.If the hose is clear, check for blockage at the nipple on the tank.

Aug 20, 2009 | 1996 Cadillac DeVille

2 Answers

99 Cadillac Deville Coolant Leak


Most likely a cracked block or free plug that came out or loose. Other options are hozes, which I believe the dealer would have fixed. A third option is the water pump itself. 

May 06, 2009 | 1999 Cadillac DeVille

1 Answer

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do you have a cloud of white smoke out of the tail pipe?

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